RE:hi altitude tractors

To Bill's point about the domed pistons, I would have my doubts about the engine block/pistons being original.

Once you zoom in on the serial number there is a 5. 44G5R. I also believe there is a gouge right on top of the 5 which looks like the "1" you make refrence to. Check it again and see if you can see the 5 after you zoom in.

RE:hi altitude tractors

OK - I see the 5 - - I was distracted by the precision of the "gouge" - do you think it is possible that the gouge is really a 1 overstrike of the 5 - I have an AC with such an overstrike where you can read both numbers - I sent the guy a question asking for s/n off block.